public class example18 {public static void main(String[] args){
    int[] arr=new int[3];
    System.out.println("arr[0]" + arr[0]);
    System.out.println("arr[1]" + arr[1]);
    System.out.println("arr[2]" + arr[2]);
    System.out.println("数组的长度是"+arr.length) ;
}
}
